fixing python2 (open with encoding)

common/python/nomadcore/local_meta_info.py

@@ -9,6 +9,7 @@ from nomadcore import compact_sha
 import json
 import os, re
 from nomadcore.json_support import jsonCompactS, jsonCompactD, jsonIndentD
+from io import open
 """objects to handle a local InfoKinds with unique name (think self written json)"""
 
 class InfoKindEl(object):